The Doppler effect
Grade 11 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
A toy buzzer on a moving cart makes 350 Hz; as it approaches, it is heard at 368 Hz. By how many hertz is the pitch raised, Bo?
A model train's whistle makes 500 Hz; as it approaches, it is heard at 531 Hz. By how many hertz is the pitch raised, Esme?
Read this first
Use this
Wave diagram seen from above (example data):
In the wave diagram, where are the ripples closest together, Jun?
- They are evenly spaced
- Behind the dipper
- In front of the dipper
In the wave diagram, why are the ripples bunched in front, Luz?
Use the picture in question 3.
- The dipper shakes faster in front
- The water is shallower in front
- The dipper moves forward between ripples
A train blows its horn as it comes toward a listener on a platform. How does the pitch sound, Milo?
- The same, just louder
- Lower, since the train is still far away
- Higher than the horn's own pitch
The train passes and moves away, still sounding its horn. How does the pitch sound now, Noah?
- Higher than the horn's own pitch
- The same, just quieter
- Lower than the horn's own pitch
What does a listener notice as a buzzing toy car rolls past, Pia?
- The pitch drops as it passes
- The pitch rises as it passes
- The pitch stays the same
As a train approaches and passes, what happens to the frequency the horn itself makes, Ren?
- It stays the same
- It falls, then rises
- It rises, then falls
Why does the horn sound higher to the listener as the train approaches, Tala?
- The horn is blown harder
- Its waves reach the listener bunched together
- Sound moves faster near a train
A toy buzzer sits still on a table. Does a listener hear a Doppler shift, Zee?
- Yes, a higher pitch
- Yes, a lower pitch
- No, since nothing is moving